Leases and Other Commitments - Balance Sheet and Other Information Related to Leases (Details) - USD ($) $ in Millions	Jan. 31, 2022	Jan. 31, 2021
Operating leases:
Operating lease right-of-use assets	$ 2,880	$ 3,204
Operating lease liabilities, current	686	766
Noncurrent operating lease liabilities	2,703	2,842
Total operating lease liabilities	3,389	3,608
Finance leases:
Accumulated depreciation	$ (528)	$ (410)
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Property and equipment, net	Property and equipment, net
Property and equipment, net	$ 400	$ 194
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	Accounts Payable and Other Accrued Liabilities, Current	Accounts Payable and Other Accrued Liabilities, Current
Accrued expenses and other liabilities	$ 114	$ 35
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Other noncurrent liabilities	Other noncurrent liabilities
Other noncurrent liabilities	$ 271	$ 93
Total finance lease liabilities	$ 385	$ 128
Weighted average remaining lease term
Operating leases (in years)	7 years	7 years
Finance leases (in years)	3 years	4 years
Weighted average discount rate
Operating leases	2.10%	2.20%
Finance leases	1.90%	1.90%
Computers, equipment and software
Finance leases:
Computers, equipment and software	$ 928	$ 604